How would you jump while moving right?
Tip hand right to hit space with that big thumb joint
Tip hand left and flick space bar with ring finger nail after curling it way under
Looking more closely at the second one, it looks like you have an usually high range of motion in your lower thumb joints. I doubt many people can extend the lowest (wrist attaching) one like that while also flexing the next one to that degree. Did you ever break that hand? It might just be the result of building flexibility at that position over time, or just genetics if your right thumb is the same.